Corrosion Inhibition Of Copper Research Articles

A comparative study of novel synthesized sulfamide compounds: Electrochemical, morphological, XPS, and theoretical investigations on copper corrosion inhibition in 1.0 M HCl

This study investigates the corrosion inhibition performance of N-phenyl sulfamide (NPS) and N-phenyl piperazine sulfamide (NPPS) for copper in a solution of 1.0 M hydrochloric acid (HCl) through a comprehensive combination of experimental and theoretical approaches. Electrochemical methods (polarization measurements and electrochemical impedance spectroscopy (EIS)), characterization techniques (FTIR, ATR, SEM and XPS investigations), and theoretical calculations are employed to analyze the inhibitive properties and provide insights on how the inhibitors and copper surface interact. Results from polarization and EIS analyses reveal that NPS and NPPS, both at a concentration of 400 mg/L, deliver substantial corrosion inhibition, achieving rates of 92.33 % and 98.70 % for polarization, and 93.60 % and 96.51 % for EIS, respectively, which gives NPPS an advantage over the other inhibitor with high inhibitor efficiency. SEM and XPS investigations confirm the adsorption of these inhibitors to the copper surface, resulting in a notably smoother and more uniform appearance with minimal damage, especially for NPPS. Theoretical calculations employing the DFT-B3LYP method provide valuable insights into the molecular properties of NPS and NPPS. These simulations support the outcomes of the tests and give insight into how NPPS inhibitor act as stronger inhibitor compared with NPS inhibitor. Overall, this study enhances our understanding of corrosion protection mechanisms and offers crucial information in order to establish robust copper corrosion inhibitors for acidic conditions. The combination of theoretical and experimental approaches offers a thorough framework for investigating corrosion inhibition and opens the door for the creation of sophisticated and effective inhibitors to protect copper from corrosive attacks.

Experimental and theoretical investigation of phenyl disulphide as an effective inhibitor for copper in sodium chloride medium

Finding effective organic corrosion inhibitors is crucial for enhancing copper's corrosion inhibition performance in corrosive environments. This study focuses on the corrosion inhibition effect of Phenyl disulphide (PDF) on copper in 3.5 wt% NaCl solution. The results show that adding 2 mM PDF to NaCl solution decreased the corrosion current density from 6 μA/cm2 to 1.1 μA/cm2, with a corrosion efficiency of 81.7%. XPS analysis revealed that a protective S-Cu bonding layer was formed on the surface of copper, effectively restraining the corrosion process of copper. In addition, quantum chemistry calculations indicated that PDF was highly reactive and susceptible to electrophilic and nucleophilic attacks. The molecular dynamics simulation demonstrated that the molecule PDF adhered to the surface of Cu(111) in a parallel fashion. The binding energy was also calculated to be 235.8 kJ/mol, which effectively guarded the Cu surface and prevented contact with the Cl- containing corrosion medium.

Rhododendron simsii leaf extract as a corrosion inhibitor for Cu in 0.5 M H2SO4: Experimental and theoretical studies

This study focuses on the utilization of a facile method to obtain Rhododendron simsii leaves extract (RSLE) as an efficient green corrosion inhibitor for Cu in 0.5 M H2SO4. The functional groups in RSLE were characterized using Fourier transform infrared spectroscopy (FTIR). The corrosion inhibition effect of RSLE was comprehensively evaluated by combining weight loss, electrochemical and surface analysis methods. The results showed that the maximum corrosion inhibition efficiency for Cu in the temperature range of 298 K∼308 K was more than 92.6% when the concentration of RSLE was 500 mg/L. RSLE is a mix-type corrosion inhibitor, and the adsorption on the surface of Cu was in accordance with the Langmuir model. In addition, the reaction sites and adsorption configurations on the Cu (1 1 1) surface of several typical active molecules in RSLE were analyzed by quantum chemistry (QC) and molecular dynamics simulation (MDS). The combination of experimental and theoretical results confirms that RSLE has excellent corrosion inhibition properties for Cu in acidic environments. In this study, an efficient corrosion inhibitor for copper corrosion in acidic environments was extracted for the first time from Rhododendron simsii leaves, providing a new perspective for future Cu corrosion prevention studies.

Sulfonated Zinc Phthalocyanine Coating as an Efficient and Ecofriendly Corrosion Inhibitor for Copper Surfaces: An In Silico Led Design and Its Experimental Validation.

The current study highlights the successful integration of an in silico design with experimental validation to create a highly effective corrosion inhibitor for copper (Cu) surfaces. The synthesized sulfonated zinc phthalocyanine (Zn-Pc) is electrochemically characterized and demonstrates an impressive 97% inhibition efficiency, comparable to the widely used industrial corrosion inhibitor, BTA, for Cu surfaces. The corrosion inhibition is comprehensively analyzed through potentiodynamic polarization and impedance spectroscopy techniques, supported by their respective equivalent circuits. Furthermore, the sample undergoes thorough characterization using scanning electron microscopy, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, contact angle measurements, and atomic force microscopy. Density functional theory calculations reveal that sulfonated Zn-Pc exhibits the highest interaction energy, underscoring its exceptional inhibition properties. These results open possibilities for utilizing computational methods to design and optimize corrosion inhibitors for protection of Cu surfaces.

Novel dynamic method based on CV-SECM and SWV-SECM for the in situ chemical imaging of reactive metal surfaces undergoing corrosion and corrosion inhibition illustrated with the case of copper corrosion inhibition by benzotriazole

A novel dynamic method for the chemical imaging of actively corroding metal surfaces using scanning electrochemical microscopy (SECM) is proposed by using CV-SECM and SWV-SECM. This consists of an adequate coupling of a repetitive voltammetric operation at the SECM tip while conducting the rastering routine for scanning a reactive copper surface, as well as its inhibition by benzotriazole. In this method, gold microelectrodes are employed as SECM tips, and therefore their electrochemical behaviour towards collection and redissolution of Cu2+ ions from synthetic solutions containing Cu2+ ions. Next, the dynamic application of voltammetric methods for the collection and stripping of copper on the Au probes while mapping copper surfaces was investigated. The proof of concept first involved continuous cyclic voltammetry (CV-SECM) in an acidified NaCl solution, in terms of Cu2+ dissolution and surface redox activity (with SECM in the feedback mode). Then, square wave voltammetry (SWV-SECM) was used to detect small copper dissolution from corroding and inhibitor-protected metal surfaces. The results are consistent with a heterogeneous nature of copper degradation and the development of protective films and passive layers.

Inhibition behavior of new ecological corrosion inhibitors for mild steel, copper and aluminum in acidic environment: Theoretical and experimental investigation

It is well known that the most practical approach to prevent metal from their degradation when it is in contact with aggressive solution is the application of inhibitors. The present work was designed to evaluate the inhibition behavior and the adsorption process of (E)‑1‑(5‑methylfuran‑2‑yl)‑3‑(6‑phenylimidazo[2,1‑b]thiazol‑5‑yl)prop‑2‑en‑1‑one (MF-PIT) for various metals (Copper (Cu), Mild steel (MS), and Aluminum (Al)) in 1 M HCl using electrochemical techniques, surface analysis characterization, and theoretical approaches. Firstly, DFT calculations and molecular dynamic simulation were executed to explore the reactivity of the studied inhibitor, and the adsorption configuration indicated in each metal. Before the experimental test, the environmental toxicity was evaluated and confirmed the safety of using the studied concentration. PDP results showed a good inhibition performance with inhibition efficiency of around 97.5% for copper, 95.9% for Mild steel, and 92.2% for Aluminum at the optimum concentration of 10−4 M. These results confirmed the EIS experiments and revealed that MF-PIT acted as a mixed-type inhibitor for the three metals. The adsorption of MFPIT obeyed the Langmuir isotherm model and form a strong bond with the studied metallic samples. The inhibition performance of MF-PIT showed a good correlation with the theoretical finding.

A comparative study of pyridine and pyrimidine derivatives based formamidine for copper corrosion inhibition in nitric acid: Experimental and computational exploration

This paper investigates the performances of two synthesized formamidine derivatives, namely: N,N-dimethyl-N’-(pyridin-2-yl) formamidine (A) and N,N-dimethyl-N’-(pyrimidin-2-yl) formamidine (B) to inhibit the corrosion of copper in 1.0 M HNO3 solution at fixed temperatures. Different tools, viz. electrochemical, chemical, and microscopic techniques were utilized in this paper. The evaluated inhibition efficiencies (% IEs) of the tested formamidine derivatives increased with their concentrations. Results indicated that the tested compounds acted as mixed-kind inhibitors with anodic seniority. The acquired great% IEs of such compounds were mainly attributed to the strong adsorption of the compounds’ molecules on the copper surface. The mode of adsorption was agreed with Langmuir isotherm. The results acquired from all utilized tools agreed with each other which disclosed that the %IE values of inhibitor A were somewhat lesser than those of inhibitor B under analogous circumstances. The influence of temperature was investigated and revealed that the %IE values decreased with rising temperature. Also, thermodynamic parameters were evaluated and discussed herein. The kinetics and mechanisms of the copper corrosion and its inhibition by the tested compounds were investigated. Molecular modeling provided strong evidence for the preference of the molecules A and B for their adsorption on the copper surface, while DFT investigations underlined the importance of N heteroatom as a relevant local site for molecular adsorption.

A Comprehensive Computational Study of N-Phenylacetamide Derivatives as Corrosion Inhibitors for Copper: Insights from DFT and Molecular Dynamics

A Comprehensive Computational Study of N-Phenylacetamide Derivatives as Corrosion Inhibitors for Copper: Insights from DFT and Molecular Dynamics

Controlled Delivery of 2-Mercapto 1-Methyl Imidazole by Metal-Organic Framework for Efficient Inhibition of Copper Corrosion in NaCl Solution.

In this paper, zeolitic imidazolate framework-8 was modified by N-(3-aminopropyl)-imidazole to obtain a novel MOF called AMOF. Subsequently, AMOF served as a carrier for the delivery of 2-mercapto-1-methyl imidazole (MMI) to inhibit the corrosion of Cu. Scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction were applied to characterize the morphologies and structures of AMOF and AMOF@MMI. Ultraviolet-visible spectroscopy and thermogravimetric analysis were adopted to value the capacity of the load and release of the AMOF, respectively. The mass ratio of loaded MMI molecules was 18.15%. In addition, the inhibition behavior of AMOF@MMI for Cu was evaluated by polarization curves and electrochemical impedance spectroscopy. The results indicated that the AMOF loaded MMI successfully, and the released MMI could adsorb on the Cu surface and inhibit the Cu corrosion. The inhibition efficiency could reach 88.2%. The binding and interaction energies between the AMOF surface and the MMI were -16.41 kJ/mol and -20.27 kJ/mol.

Oil Extracted from Spent Coffee Grounds as a Green Corrosion Inhibitor for Copper in a 3 wt% NaCl Solution

The aim of this research is to study the use of the spent coffee grounds (SCGs) as a novel and environmentally friendly corrosion inhibitor. The oily fraction obtained from decoction extraction was subjected to analysis using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The inhibitive action of SCG extract on the corrosion of copper in a 3 wt% NaCl solution was studied via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The research findings elucidate that the extract derived from SCGs functions as a cathodic inhibitor, primarily impeding the diffusion of oxygen molecules towards the copper substrate. Notably, the inhibitory effectiveness exhibits an improvement with ascending concentrations of the SCG extract. This augmentation culminates in a remarkable 96% inhibition efficiency when the SCG extract concentration reaches 0.6 g/L. Furthermore, it is observed that the SCG extract undergoes adsorption onto the copper surface, a phenomenon that conforms to the Langmuir adsorption isotherm.

Exploring the Efficacy of Benzimidazolone Derivative as Corrosion Inhibitors for Copper in a 3.5 wt.% NaCl Solution: A Comprehensive Experimental and Theoretical Investigation.

This study focuses on the synthesis, theoretical analysis, and application of the corrosion inhibitor known as benzimidazolone, specifically 1-(cyclohex-1-enyl)-1,3-dihydro-2H-benzimiazol-2-one (CHBI). The structure of CHBI was determined by X-ray diffraction (XRD). The inhibitory properties of CHBI were investigated in a 3.5 wt.% NaCl solution on pure copper using various electrochemical techniques such as potentiodynamic polarization curves (PDPs) and electrochemical impedance spectroscopy (EIS), as well as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), UV-visible spectroscopy, and theoretical calculations. The obtained results indicate that CHBI is an excellent inhibitor, exhibiting remarkable effectiveness with an inhibition rate of 86.49% at 10-3 M. To further confirm the extent of adsorption of the inhibitory molecule on the copper surface, density functional theory (DFT) and Monte Carlo (MC) simulation studies were conducted. The results of this study demonstrate the synthesis and characterization of CHBI as a corrosion inhibitor. The experimental and theoretical analyses provide valuable insights into the inhibitory performance of CHBI, indicating its strong adsorption on the copper surface.

Enhanced corrosion inhibition effect of sodium tartrate on copper in potable water

In this study we have reported sodium tartrate (ST) and Zn2+ as the potential mixed corrosion inhibitors for copper corrosion in drinking water, by using electrochemical impedance and polarization techniques. The results of potentio-dynamic polarization indicated that sodium tartrate could be used as mixed type inhibitor with Zn2+. ST was found to be 92% effective for slowing down both the anodic and cathodic reaction rates. It was additionally found that ST could coat the surface of copper to prevent it from conducting electricity. As the inhibitor concentration increased, the stability of the formed protective layer was also improved. The results obtained from studies like SEM, EDAX, AFM, and water contact angle clearly indicated the development of a barrier by inducing the lotus effect on copper surface. The water contact angle measurement results suggested that the coating formed in the presence of inhibitor was superhydrophobic, and the surface was homogeneous.

Corrosion inhibition of copper in NaCl solution by water extract of mint leaves

Metal corrosion is a significant issue for any nation's economy and population. The researchers have attempted to reduce corrosion damage losses with both synthetic and green inhibitors. Since green corrosion inhibitors (GCI) are innocuous, effective in corrosion prevention, environment-friendly, and reasonably priced, they have become a favorite solution to the corrosion problem. In this study, the mitigation of copper (Cu) corrosion in 0.5 M NaCl by the water extract of mint leaves (AEML) is investigated through electrochemical measurements and surface images. The functional activity of AEML is checked with the UV–visible (US) and Fourier transform infrared spectroscopy (FS) techniques. According to the findings of electrochemical measurements, AEML efficacy is found to increase with its concentration. The maximum inhibitory efficacy of 70 % (TC) is achieved with 300 mg/L of AEML. Also, the images captured by optical microscopy (OM) confirm that the extract efficiently prevents copper in 0.5 M NaCl. Based on the overall findings of this study, it can be concluded that AEML has good inhibitory efficiency and is suitable for inhibition applications.

Trisodium citrate as a potential and eco-friendly corrosion inhibitor of copper in potable water

In this work, the mixture of trisodium cittrate and Zn2+ was used as binary (hetero type) inhibitor for corrosion inhibition of copper metal in potable water. The binary inhibitor system (Zn2+ and trisodium citrate) was used to form hydrophobic surfaces on copper submerged in potable water. Water contact angle (WCA) was found to be 155°4° when the inhibitor was present, whereas it was 84°2° when there was no inhibitor. These observations suggested the development of superhydrophobic layer on the surface of copper in drinkable water. Electrochemical impedance spectroscopy (EIS – AC mode), and potentiodynamic polarization (DC mode) experiments conveyed that the copper surface could be protected by utilizing the mixture of trisodium citrate and Zn2+ in potable water. The morphological studies including SEM (coupled with EDX), AFM, and WCA were evidenced the formulation of a hetero-type inhibitor for the corrosion inhibition of copper in potable water. In this study, the decline in the double-layer capacitance and the rise in the charge transfer resistance were due to the adsorption of inhibitor confirming the development of protective layer, which EIS, SEM, EDX, AFM, and WCA studies also supported. Thus, there was a synergism observed between TSC and Zn2+, and the formulation consisting of TSC and Zn2+ provided 83% of inhibition efficiency (IEp). So, it was suggested that the approach reported in this study could be a simple method for obtaining the superhydrophobic copper surface.

Adsorption films based on indazole derivatives for application to protect Cu in sulfuric acid: Experimental and theoretical approaches

BackgroundFinding more cost-effective, low-toxicity corrosion inhibitors to reduce copper corrosion in acidic environments is critical. MethodsThe anti-corrosion abilities and mechanisms of 5‑bromo-1H-indazole (5-BIA) and 7‑bromo-1H-indazole (7-BIA) on Cu in 0.5 M H2SO4 environment have been explored by a way of combining both experimental and theoretical approaches. Significant findingsElectrochemical experiments have shown that both 5-BIA and 7-BIA are capable of acting as highly effective corrosion inhibitors for copper, and 5-BIA has a more prominent protective ability than 7-BIA, which has also been proved by weight loss experiments, SEM and AFM. The corrosion inhibition efficiency (ηE) of 1.5 mM 5-BIA and 1.5 mM 7-BIA is as high as 97.1 % and 94.0 %, respectively. The adsorption of 5-BIA and 7-BIA on the metal surfaces conforms to the Langmuir monolayer adsorption model, and both chemosorption and physical adsorption exist. In addition, quantum chemical calculations reveal that 5-BIA has smaller energy gap (ΔE) and hardness (η) values, and larger dipole moment (μ), absolute electronegativity (χ), and chemical softness (σ) values, thus exhibiting better anti-corrosion ability. Molecular dynamics simulations display that both 5-BIA and 7-BIA can be adsorbed on the Cu (111) surface in an approximately parallel approach, which is conducive to achieving 5-BIA and 7-BIA to hinder the process of copper corrosion as much as possible.

Green synthesis of novel bis structure of (Carbamothioyl) oxalamide derivatives as corrosion inhibitors for copper in 3.5% NaCl; experimental and theoretical investigation

Carbamothiol oxalamide derivatives as new compounds are synthesized and named N1, N2-bis (2- ((2-hydroxyethyl) amino) ethanethiol) oxalamide (bis 1), and N1, N2- bis(2-(bis(2-hydroxyethyl) amino) ethanethiol) oxalamide (bis 2). The noteworthy highlights of this method are eco-friendly, excellent yields, economic, catalyst-free, and solvent-free. Their chemical structures are clarified and validated using elemental analysis and spectroscopic techniques such as Fourier-transform infrared spectroscopy (IR), 1H, and 13C- nuclear magnetic resonance. Then, Weight loss (WL), electrochemical impedance spectroscopic (EIS), and potentiodynamic polarization (PDP) techniques are applied to examine the inhibition impact of these new derivatives on copper in 3.5% NaCl. The density functional theory is used to apply theoretical computations. The results of the experiments indicate that these substances are effective corrosion inhibitors, and their inhibition efficiencies rise with concentration. The bis 2 compound having four OH groups, give the highest efficiency compared to bis 1. There was good agreement on the outcomes of the various procedures. Utilizing 0.01 M of bis 2 to examine the surface under the SEM reveals the existence of an adsorbed layer. All organic molecules, including nitrogen, sulfur, and oxygen, block the metal surface as shown by the electronic parameters highest occupied and lowest unoccupied molecular orbital energy, and ΔEg. The results from theoretical calculations and those from experimental measurements correspond well.

Examining Leucine As an Environmentally Friendly Corrosion Inhibitor for Cu and Co Chemical-Mechanical Planarization (CMP)

Metal chemical-mechanical planarization (CMP) is a key step in semiconductor processing of microchips and devices. The slurries used in CMP contain abrasives, oxidizers, chelating agents, and corrosion inhibitors. Despite the desired removal of metal, corrosion inhibitors are used to protect the underlying metal features from aggressive corrosion, and to this end, azoles, such as benzotriazole (BTA), are the most commonly used corrosion inhibitor in Cu CMP,1-3 and Co CMP4-5 slurries, although it was recently found that the surface interaction between BTA and Co is weaker than BTA and Cu.6 When Co is used as a barrier layer with Cu interconnects the addition of benzotriazole (BTA) has been shown to eliminate galvanic corrosion between Cu and Co.1,7 Spent slurries, however, pose an environmental hazard as the azole corrosion inhibitors do not readily degrade in conventional wastewater treatment processes.8 Thus, amino acids, such as leucine, is examined as a possible BTA substitute, being likely to readily biodegrade. Leucine is a known corrosion inhibitor of steel, nickel, nickel-copper, copper and cobalt in acid,9 and is examined here under typical CMP alkaline conditions.Linear sweep voltammetry with ohmic corrosion was used to assess the corrosion current density, icorr, and the corrosion potential, Ecorr, of Cu and Co, as well as the galvanic corrosion between Co and Cu, using a rotating disk electrode. Varying amounts of L-leucine (5- 40 mM) in a pH 8 and 10 KOH electrolyte containing H2O2 as the oxidant, with and without arginine as the complexant, was used as a representative model polishing slurry without abrasive particles. Leucine was an effective inhibitor of Cu at pH 8. At a pH of 10 the icorr of Cu was higher, compared to the pH 8 electrolyte, indicating the importance of the protonation of the amine group of leucine on corrosion inhibition, where the pH < pKa. Leucine was less beneficial for the Co corrosion inhibition. When arginine was present there was a larger difference in the corrosion potential between Co and Cu, making cobalt prone to galvanic corrosion, compared to a case when arginine was not present. Eliminating arginine, in an excess of leucine, favorably inhibited copper and reduced the galvanic corrosion of cobalt, but enhanced the corrosion of Co alone. The adsorption energy was determined for Cu by varying the amount of leucine in the electrolyte and found to be predominately physisorbed compared to chemisorbed.Acknowledgement: This work was supported by the Semiconductor Research Corporation grant (Task 3100.001) under the Global Research Collaboration program. References B. Peethala, H. Amanapu,U. Lagudu and S. Babu, J. Electrochem. Soc. 159 H582 (2012).S. Choi, S. Tripathi, D.A. Dornfeld, F.M. Doyle, J. Electrochem. Soc. 157 1153 (2010).Q. Luo, S. Ramarajan, and S. V. Babu, Thin Solid Films, 335, 160 (1998).D. Gallant, M. Pézolet, S. Simard, Electrochim. Acta, 52, 4927 (2007).H.-Y. Ryu, C.-H. Lee, J.-K. Hwang, H.-W. Cho, N.Y. Prasad, T.-G. Kim, S. Hamada, J.-G. Park, ECS J. Solid State Sci. Technol. 9 064005 (2020).H.-Y Ry, C. H. Lee, S. U. Lee, S. Hamada, N. P. Yerriboina, J.-G.Park Microelectron. Eng. 262 111833 (2022).S. Bilouk, L. Broussous, R.P. Nogueira, V. Ivanova, C. Pernel, Microelectron. Eng. 86 2038 (2009).Y.-M. Lee, K.-D. Zoh, Chem. Eng. J. 359, 1502 (2019).L. Hamadi, S. Mansouri, K. Oulmi, A. Kareche, Egypt. J. Pet., 27, 1157 (2018).

Recycling of expired ciprofloxacin in synthetic acid rain (SAR) solution as a green corrosion inhibitor for copper: a theoretical and experimental evaluation

The antibiotic Ciprofloxacin (CIPRO) was investigated as a new inhibitor for copper corrosion in Synthetic Acid Rain Solution (SAR) utilizing Mass Loss (ML) as a chemical method, Potentiodynamic Polarization (PDP), and Electrochemical Impedance Spectroscopy (EIS) as electrochemical techniques. In the presence of 600 ppm of the antibiotic CIPRO, the protection percentage reached 90.1% according to the EIS technique. Thermodynamic adsorption and activation characteristics were evaluated and described. The CIPRO adsorption on the Cu surface in the SAR solution was physical adsorption and complied with the Langmuir isotherm. According to PDP curves, the studied medication was served as a mixed type of inhibitor. This medication prevented corrosion by adhering to the metallic surface, which was demonstrated by Atomic Force Microscopy (AFM), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM–EDX), and Fourier-Transform Infrared Spectroscopy (FTIR). Results from the Density Functional Theory (DFT) and Monte Carlo simulations (MC) complement experimental results. The inhibition efficiencies obtained via different methods are consistent with each other.Graphical

Corrosion inhibition effect of expired ibuprofen drug on copper in sulfuric acid solution

The application of copper as a material in various fields is widely recognized. However, in acidic environments, the electrical and mechanical properties of copper undergo negative alterations, resulting in its dissolution. To protect copper from degradation, the most effective approach is to employ inhibitors. Hence, in this paper, the expired ibuprofen drug has been investigated as a corrosion inhibitor for copper in 0.5 M H2SO4, employing weight loss and electrochemical tests. Compared with the pharmaceutical products used by other researchers in this field, the results showed that ibuprofen is highly effective in protecting copper from corrosion. It was noted that the inhibitory efficacy of ibuprofen increases with concentration. In addition, it was found that its adsorption follows Langmuir isotherm.

Lycium barbarum leaf extract as biodegradable corrosion inhibitor for copper in sulfuric acid medium

Corrosion protection of metals is a significant research field that requires the development of safe, non-toxic, cost-effective, and environmentally friendly high-performance corrosion inhibitors. This study employed a water-based extraction method to obtain Lycium barbarum leaf extract (LBL) and utilized a series of experimental and theoretical approaches to evaluate its corrosion protection efficacy on copper in 0.5 mol/L sulfuric acid environments. The electrochemical tests unequivocally demonstrated the outstanding corrosion inhibition ability of LBL, with corrosion inhibition efficiencies of 92.9%, 92.8%, and 94.1% observed at a concentration of 400 mg/L and temperatures of 298 K, 303 K, and 308 K, respectively. Advanced techniques such as Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were employed to comprehensively characterize the chemical composition and functional groups of LBL and the surface of copper samples immersed in the LBL. Furthermore, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to observe and analyze the morphology of acid-corroded copper surfaces and those protected by LBL. As a supplement to the experimental findings, quantum chemical calculations and molecular dynamics simulations were employed to explore the theoretical aspects of the active constituents in LBL and simulate their adsorption behavior.